Name: ______Block: ______
Science 9 – Ch. 10 Current Electricity
10.3 Electric Potential Difference (Voltage) (pg. 310-314)
The energy each electron has is called the electric potential of the electron.
Electric Potential Difference is also known as ______.
Voltage:
§ Difference in electrical charge ______________
§ Voltage is the change in ______per unit charge.
The volt (V) is defined as ______:
V = Voltage (V) E = Electrical Energy (J) Q = Charge (C)
Example 1: A flashlight battery is made with two AAA cells. The cells each have a total charge of 6480 C and have 9720 J of potential energy. What is the voltage of the cells?
Example 2: car battery has a voltage of 12 V and uses 151 kJ of energy to start a car. How
much electric charge does the battery hold?
Measuring Voltage
§ Measured with a ___ ____________– measures the difference in voltage between 2 points – always connected in ______with devices
§ The circuit diagram symbol for a voltmeter is ______
§ Reading Analog Voltmeters
§
Cells in Series:
The 2 pumps can lift _______________as high as one pump but __________ lift more water.
When the pumps are connected in series , water goes through the _____________pump and then to the ______________pump
There is only _____________ path – through both pumps (one time)
When cells are connected in ______, the total voltage ______ of the individual cells.
Cells in Parallel:
· The two pumps can lift twice as much water but only to the ____________ height as one pump
· There are _________ paths – each path goes through one of the pumps
When cells are in ______, the voltage is the ______ across.
HW: Text pg. 314 CYU Q 2, 4, 5, 6, 9, 10, 11, 12
Reading an Analog Voltmeter Problem Worksheet; Voltage, Energy, Charge Worksheet
Name: ______Block: ______
10.3 Electric Potential Difference W/S
1. A flashlight battery is made with two AAA cells. The cells each have a total charge of 6480 C and have 9720 J of potential energy. What is the voltage of the cells?
2. During the time that a light bulb was on, it converted 54 kJ of energy into light energy and heat energy. The light bulb was plugged into a 120 V outlet. What amount of charge, in coulombs, passed through the light bulb while it was on?
3. A Van de Graaff dome has a voltage of 350 kV and a charge of 73 _C. How muchelectric potential energy does the charge have?
4. A car battery has a voltage of 12 V and uses 151 kJ of energy to start a car. Howmuch electric charge does the battery hold?
5. A capacitor is a device that stores energy. The capacitor of a camera flash unit has a charge of 0.83 C and a voltage of 480 V. How much energy is stored in the capacitorto convert electrical energy into light energy?
6. An electron has a charge of 1.6 _ 10–19 C. An electron in a television uses
1.2 10–15 J of energy to accelerate it toward the screen. What voltage is used to accelerate the electron?
7. A lithium photo battery has a voltage of 6 V and energy of 5400 J.
(a) What is the amount of charge in the battery?
(b) How many electrons is this?